91678525 has 6 divisors (see below), whose sum is σ = 113681402. Its totient is φ = 73342800.

The previous prime is 91678523. The next prime is 91678571. The reversal of 91678525 is 52587619.

It can be written as a sum of positive squares in 3 ways, for example, as 1466521 + 90212004 = 1211^2 + 9498^2 .

It is not a de Polignac number, because 91678525 - 2¹ = 91678523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91678523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1833546 + ... + 1833595.

Almost surely, 2^91678525 is an apocalyptic number.

It is an amenable number.

91678525 is a deficient number, since it is larger than the sum of its proper divisors (22002877).

91678525 is a wasteful number, since it uses less digits than its factorization.

91678525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667151 (or 3667146 counting only the distinct ones).

The product of its digits is 151200, while the sum is 43.

The square root of 91678525 is about 9574.8903387976. The cubic root of 91678525 is about 450.9093135787.

The spelling of 91678525 in words is "ninety-one million, six hundred seventy-eight thousand, five hundred twenty-five".